There are a lot of factors that go into pricing event photography, but none of them usually involves the photographer paying to do the work for you. Many have a minimum charge. They have to account for the time to pack, load, unload, and unpack their equipment, the time spent setting up lighting and shooting the event, then doing all of that in reverse. They may also be expected to accommodate specific shots the CB wants. And they are going to have to work around multiple other photographers the whole time, from the sound of it. I dont know any good photographers who would be interested in this at all, let alone interested in paying for the experience, lol.